Ch. 2 Flashcards
1
Q
- A particular application of the once-through boiler design is the steam-flooding boiler. This is a boiler used for flooding oil wells with steam in order to increase the oil recovery.
a. True
b. False
A
a. True
2
Q
- Steam injection is a procedure for increasing the recovery of oil from wells, which have been _______ depleted.
a. completely
b. partially
c. entirely
d. almost
A
b. partially
3
Q
- The reason for the use of steam is to allow the maximum quantity of heat to be put into the well with the ________ quantity of injected fluid.
a. minimum
b. maximum
c. most
d. super
A
a. minimum
4
Q
- In order to keep the salts in the boiler water dissolved, and to avoid deposits on the tubes, the steam produced contains _____ moisture.
a. 15%
b. 30%
c. 20%
d. 50%
A
c. 20%
5
Q
- Outputs from Steam Flooding Boilers range from ___ million kJ/h to ___ million kJ/h in standard sizes.
a. 1 , 100
b. 5 , 50
c. 100 , 200
d. 1 , 50
A
b. 5 , 50
6
Q
- One method of burning _____ is called fluidized bed combustion.
a. liquids
b. wood
c. methane
d. coal
A
d. coal
7
Q
- Crushed coal from 1.6mm to 6mm is injected into the bed by means of an ________.
a. elevator
b. air-stream
c. injector
d. pulverizer
A
b. air-stream
8
Q
- Combustion air is introduced underneath the bed and is blown through the entire bed.
a. True
b. False
A
a. True
9
Q
- Fluidized bed boilers have the ability to burn ________ fuels in an environmentally acceptable manner.
a. low grade
b. high grade
c. liquid
d. vaporized
A
a. low grade
10
Q
- Combustion can take place at temperatures ranging from ____°C to ____°C instead of normal combustion temperatures of 1600°C to 1900°C for pulverized coal and oil firing.
a. 300 , 500
b. 200 , 400
c. 800 , 900
d. 600 , 700
A
c. 800 , 900
11
Q
- Because of the low operating temperatures, an inexpensive material such as CaCO3 (lime) can be added to the bed. It acts as a sorbent to remove _____ from the flue gases.
a. SO2
b. O2
c. NoX
d. Water
A
a. SO2
12
Q
- Bubbling Fluid Bed Boilers (BFB) are subject to _____ erosion rates.
a. low
b. moderate
c. extreme
d. high
A
d. high
13
Q
- The concept of using waste energy to generate steam has been gaining in popularity. This is mainly because of ______ fuel costs.
a. lower
b. moderate
c. higher
d. more
A
c. higher
14
Q
- A simple combined cycle power generation system can consist of:
a. A single gas turbine generator
b. A HRSG (heat recovery steam generator)
c. A single steam turbine-generator
d. Condenser
e. All of the above
A
e. All of the above
15
Q
- The HRSG has supplemental firing in the form of duct burners. These are coal fired and are used to add additional heat to the boiler coils.
a. True
b. False
A
b. False
16
Q
- The main application for ______ boilers is steam generation using gas turbine exhaust gas as a heat source.
a. fluidized bed
b. HRSG
c. once through
d. steam flooding
A
b. HRSG
17
Q
- The Kraft Process uses sodium sulfide (NaSO4) as a makeup chemical.
a. True
b. False
A
b. False
18
Q
- In the black liquor process combustion air is fed at three elevations of the furnace: primary, secondary, and ________.
a. upper
b. lower
c. tertiary
d. after
A
c. tertiary
19
Q
- The black liquor droplets must be ______ enough to minimize entrainment in the combustion gases.
a. small
b. large
c. dispersed
d. fine
A
b. large
20
Q
- The primary function of the recovery boiler is to process ______ liquor.
a. white
b. green
c. black
d. liquor
A
c. black
21
Q
- List the five functions of the auxiliary fuel burners:
1) Raise steam during startup
2) Sustain a stable ignition while establishing a char bed
3) Stabilize conditions during upsets in the black liquor feed
4) Produce extra steam as required by the process of for power production
5) Burn out the char bed when shutting down
6) Maintain furnace temperatures
a. 1, 2, 3, 4, 5
b. 3, 4, 5, 6
c. 1, 3, 5
d. 1, 2, 3, 4, 5, 6
A
a. 1, 2, 3, 4, 5
22
Q
- If water contacts molten smelt, a violent explosion will result. It is not a _______ reaction but a _________ reaction.
a. chemical, physical
b. physical, chemical
c. violent, mild
d. small, large
A
a. chemical, physical
23
Q
- If the black liquor is too ______, it too can result in an explosion.
a. strong
b. thin
c. weak
d. thick
A
c. weak
24
Q
- Heat recovery started to be added to the refuse incinerators, as did strict air pollution guidelines. The basic incinerators with waste heat recovery have evolved into _________ boilers with integral stokers.
a. packaged
b. fire tubed
c. open harth
d. water-wall
A
d. water-wall
25
206. The combustion products from burning municipal waste are very ________.
a. hot
b. corrosive
c. many
d. wet
b. corrosive
26
207. There is also corrosion caused by _________ in refuse-fired boilers.
a. chlorides
b. fuels
c. materials
d. burning
a. chlorides
27
208. The higher the tube metal temperature, the ________ the degree of tube metal loss.
a. less
b. greater
c. minimum
d. smaller
b. greater
28
209. Corrosion of the ______ furnace area of the boiler can be severe during refuse firing.
a. upper
b. middle
c. lower
d. recovery
c. lower
29
210. Inconel™ is an alloy composed mostly of ______ and chromium.
a. lead
b. copper
c. steel
d. nickel
d. nickel
30
211. Biomass is anything that is or recently was alive, such as leaves, grasses, bamboo, vine clippings, sugar cane, coffee grounds, and rice hulls.
a. True
b. False
a. True
31
212. Systems to burn wood and biomass usually involve a separate ________, called a dutch oven, or a traveling grate or vibrating grate arrangement.
a. oven
b. furnace
c. collection
d. burner
b. furnace
32
213. The pinhole grates have __________ air holes to admit air to the burning material on the grate.
a. venture-type
b. square
c. round
d. large
a. venture-type
33
214. The vibrating grate systems, have grate bars attached to a frame that _______ to remove the ash.
a. rotate
b. move
c. vibrate
d. turn
c. vibrate
34
215. The vibration also serves to aid combustion by _______ out the bed of burning biomass.
a. shaking
b. leveling
c. turning
d. moving
b. leveling
